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• Top X tips to code & debug efficiently [closed]

  - by user1510230

  I'm starting a big Java project and I wanted to have some advices that could benefit us all. What are the X (X could be 5 / 10 / ... or even 100 :) most important tips to code and debug efficiently in general (and in particular with java / javascript) ? I'll start with some basic ones : Use functions everytime a portion of code is used more than twice. Try not to code features with more than 15 lines of code in one shot. Rather write 5 lines of code then check if they work correctly then write 5 more... and so on start with the outcome of the function and then code it backwards (bottom-top approach) ... Thanks everybody

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• "An upgrade from 'precise' to 'oneiric' is not unsupported with this tool" error while upgrading

  - by tas

  A brief electrical outage interrupted my 12.04 upgrade. After many tries, which included trying to upgrade from a command line, I was able to access Ubuntu screens again. I find that the 12.04 upgrade was indeed not completed; I am still running 11.10. However, Update Manager does not give me the option of installing 12.o4 now. And, when I run Update Manager, I am asked if I want to execute a "partial install." When I answer "yes," I receive the message above. Besides a clean install, any ideas about what can I do to upgrade to 12.4?

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• Where can I find some Cocos2dx beginner tutorials?

  - by Skeith

  I have tried to start programing with Cocos2dx but I have no idea where to start and the tutorials are no very not very helpful. What I am looking for is some tutorials/guides on how to begin using cocos2dx for the total beginner. Things like how to setup a project and run it and how to do simple things like draw graphics on the screen, play sounds and get input. I am running on windows 7 and have been told by the Cocos2dx wiki that this may cause problems so if anyone has a solution to this that would also be helpful.

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• How can I extract a list of Minecraft items and recipes?

  - by Sean

  I'm designing a robust system for resolving item dependencies in Minecraft and to do so, I need to maintain a database of items and recipes. Right now, this database has to be hand-crafted (no pun intended); I would like to know if it is possible to somehow query the Minecraft jars (or perhaps more realistically, grep through them) to extract this data automatically. How can this be done? The project is currently in Python, but it can still be ported to Java without much fuss at this stage. (For the curious.)

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• Which way to make money on Android? ads, purchase, trial version?

  - by otakun85

  Hi, I want to release an app, but what is in your experience the best way to make money on android? I've seen some solutions out there, but which one is the best? Solution A: App is free and has ads. + long term income + free for customer ~ money based on usage - ads makes apps ugly - needs a internet connection, which your app may not need Solution B: App is purchased + instant income ~ money only once ~ the customer have only 15 minutes to try out the app - you need a credit card on the google market - the customer have to give money :D Solution C: Trial version Solution D: free Lite version with ads & full to pay version without adds Any other ideas?

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• Interface hierarchy design for separate domains

  - by jerzi

  There are businesses and people. People could be liked and businesses could be commented on: class Like class Comment class Person implements iLikeTarget class Business implements iCommentTarget Likes and comments are performed by a user(person) so they are authored: class Like implements iAuthored class Comment implements iAuthored People's like could also be used in their history: class history class Like implements iAuthored, iHistoryTarget Now, a smart developer comes and says each history is attached to a user so history should be authored: interface iHistoryTarget extends iAuthored so it could be removed from class Like: class Person implements iLikeTarget class Business implements iCommentTarget class Like implements iHistoryTarget class Comment implements iAuthored class history interface iHistoryTarget extends iAuthored Here, another smart guy comes with a question: How could I capture the Authored fact in Like and Comment classes? He may knows nothing about history concept in the project. By scalling these kind of functionallities, interfaces may goes to their encapsulated types which cause more type strength, on the other hand explicitness suffered and also code end users will face much pain to process. So here is the question: Should I encapsulate those dependant types to their parent types (interface hierarchies) or not or explicitly repeat each type for every single level of my type system or ...?

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• Why can't I update to 11.04?

  - by user285982

  I am using Ubuntu 10.10 64 bit, and I can browse the internet fine. I am typing this using the machine. When I attempt to use the Ubuntu Update Manager to update to 11.04, I get this error message: Failed to Fetch Fetching the upgrade failed.There may be a network problem. And when I try to change servers, here is what I get: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick/main/source/Sources.gz 404 Not Found [IP: 91.189.91.15 80] It repeats with other lines, 404 not found. Some index files failed to download, they have been ignored, or old ones used instead. Any ideas?

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• Why do so many people dislike C++?

  - by General K

  Beginners and professional, on blogs, in forums and chatrooms - people say it everywhere: C++ oh dear god no The short form of the question: For what reason is C++ so widely disliked and people are horrified by the imagination of using it for some project? I have been using a lot of different languages, including C++ by now, and I can only say that I really like it. I'm far more horrified by Delphi than by C++. Actually, I find it's an almost perfect, compiled language! I've been doing a lot of different projects in C++ as well, ranging from 3D video games to webservers and emulators for old video game consoles. And I still do not see the problem everyone else seems to have with it! It was hard for me to get into it of course, as it is quite complex and has a lot of depth, but after that it's simply great.

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• Hash Function Added To The PredicateEqualityComparer

  - by Paulo Morgado

  Sometime ago I wrote a predicate equality comparer to be used with LINQ’s Distinct operator. The Distinct operator uses an instance of an internal Set class to maintain the collection of distinct elements in the source collection which in turn checks the hash code of each element (by calling the GetHashCode method of the equality comparer) and only if there’s already an element with the same hash code in the collection calls the Equals method of the comparer to disambiguate. At the time I provided only the possibility to specify the comparison predicate, but, in some cases, comparing a hash code instead of calling the provided comparer predicate can be a significant performance improvement, I’ve added the possibility to had a hash function to the predicate equality comparer. You can get the updated code from the PauloMorgado.Linq project on CodePlex,

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• Continuing to code on large projects

  - by user3487347

  I am a hobbyist programmer, and I've started many medium - sized projects to work on just by myself. These include games, a raytracer, physics simulations etc. By the time these projects get to a certain size (around 5000 lines), I begin to slow down in adding features to the program. This is not because of a lack of ideas of what to implement in a program, but rather a struggle in how to go about it. In particular, I'm afraid of breaking what I already have working in order to implement a new feature. I've tried using version control like Git and Subversion, but these seem unnecessary when you are a one man team. I simply have a folder of "versions" of my program, one for each major change I make. How do I keep coding past this 5000 line mark? What about the 50000 line mark?

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• Do ALL your variables need to be declared private?

  - by shovonr

  I know that it's best practice to stay safe, and that we should always prevent others from directly accessing a class' properties. I hear this all the time from university professors, and I also see this all the time in a lot of source code released on the App Hub. In fact, professors say that they will actually take marks off for every variable that gets declared public. Now, this leaves me always declaring variables as private. No matter what. Even if each of these variables were to have both a getter and a setter. But here's the problem: it's tedious work. I tend to quickly loose interest in a project every time I need to have a variable in a class that could have simply been declared public instead of private with a getter and a setter. So my question is, do I really need to declare all my variables private? Or could I declare some variables public whenever they require both a getter and a setter?

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• Trying to retrace our SEO domain redirect strategy

  - by dans

  An SEO built a copy of my company's e-commerce site on another domain that contained our product's keywords in the name (i.e. as if Levi's built a duplicate site on bluejeans.com)...and then they referenced a lot of the images on the actual website from the other domain (as if Levis.com had images on it referenced like: img src="http://www.bluejeans.com/jeans-front.jpg"), but when you tried to reach the site by typing the name into the browser you would be redirected to the regular website, so the site wasn't really used for any purpose except I guess SEO. Since I didn't think this was doing anything GOOD for us at the time, I deleted the duplicate site and let the hosting on it expire, only to watch our search engine position rankings fall dramatically. Any ideas as to what was going on there? I want to get it back to understand its impact, but I don't know how it was set up. I contacted our host and they have no idea how it was set up. I suspect there was some sort of redirect in play, or something?

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• @Microsoft: please provide universal and professional concepts

  - by Marko Apfel

  Why such constructs are included in the csproj-Files? <CodeAnalysisRuleSetDirectories>;c:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\\Rule Sets</CodeAnalysisRuleSetDirectories> <CodeAnalysisRuleDirectories>;c:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\FxCop\\Rules</CodeAnalysisRuleDirectories> So it every projects needs some manual steps to clean the project file so the solution could be build on a continuous integration server. That annoying! And also in a Visual Studio mixed editions team that’s too specific for the ultimate edition. As good as Visual Studio in most cases is, sometimes it is really far away from professional coding fundamentals and best practices.

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• Problem after last update

  - by bhappy

  I am having a problem after the last update, the booting to command line problem I even can't start in the graphic fail system "xfail": X: cannot stat /etc/X11/X (no such file or directory), aborting I found some one mentioning a solution which is installing ubuntu-dektop though apt-get but it failed due to this error: Unmet dependencies " the dependencies are xserver-xorg-video-all and xserver-xorg-input" Tried to install these first also another dependencies problem. Solutions I tried: removing and installing nvidia driver removing and installing xserver Tried different versions of nvidia including the latest one which is the one I had before the update Any ideas?

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• Splice gives blank screen on startup

  - by dpb

  I just installed splice from the humble bundle, and I get a blank screen on startup. I can hear the audio, and if I move my mouse around, I can hear the menu items or something changing. I have an amd radeon HD5800 series. I'm using the fglrx-updates driver on 12.10, fully updated. Any ideas of things to try? Full screen or windowed, I get a blank window. Also, other GL games are running just fine.

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• Cannot access my own web page

  - by enflam3

  I am developing, learning and experimenting with php,html,javascript,flash and so on. Having web hosting and all of the cpanel, phpmyadmin and other utilities. One day, while updating information, connection between my computer and website just went down. I found out that it is only from this computer, where I cannot access anything. I don't know what is the reason I cannot access website, however this is what I have checked so far: Everything else opens normally, having problem only with my page. Cannot access FTP,cpanel or any kind of information related to the domain and hosting ipconfigs detects IP, but shows request timed out (so its not browser related) Turned off Firewall,AV, Rebooted computer Cleared caches,temp,cookies,histry with CCleaner Checked connectivity with both (wired,wireless) networks ISP has dynamic IP that has been changed about 3 times since issue Checked host file I am out of ideas and understanding what could cause this kind of issue, however couple minutes ago, found out that everything works with proxy server (when adding IP and port to the browsers) Can someone point out what should I check or try to get rid of this problem?

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• A separate solution for types, etc?

  - by hayer

  I'm currently in progress updating some engine-code(which does not work, so it is more like creating a engine). I've decided to swap over to SFML(instead of my own crappy renderer, window manager, and audio), Box2d(since I need physics, but have none), and some small utils I've built myself. The problem is that each of the project mentioned over use different types for things like Vector2, etc. So to the question; Is it a good idea to replace box2d and SFML vectors with my own vector class? (Which is one of my better implementations) My idea then was to have a seperate .lib with all my classes that should be shared between all the projects in the solution.

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• Triangles in a C++ STL Vector as an Objective-C member sometimes draws incorrectly in OpenGL ES

  - by Rahil627

  The polygons draw correctly 80% of the time. When it fails, a vertex is dislocated. The polygon is consistently drawn with the wrong vertex. I checked that the vector is correct during initialization, even when it's wrongly drawn. I'm using Cocos2d. The class member: @interface Polygon : CCSprite { std::vector<float> triangleVertices; } The draw function called in [Polygon draw]: + (void)drawTrianglesWithVertices:(const std::vector<float> &)v { //glEnableClientState(GL_VERTEX_ARRAY); glDisable(GL_TEXTURE_2D); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glDisableClientState(GL_COLOR_ARRAY); glVertexPointer(2, GL_FLOAT, 0, &v[0]); glDrawArrays(GL_TRIANGLES, 0, v.size()); //glDisableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_COLOR_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glEnable(GL_TEXTURE_2D); } Any ideas?

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• No sound/audio after resuming from sleep

  - by hansvonaachen

  I've made a fresh UEFI install of Ubuntu 13.10 (64 bit) on a Lenovo Ideapad Z510 laptop with Intel i5 4200M processor. Ubuntu is the only OS installed on the computer, secure boot disabled. Everythings works fine (backlight issue fixed after editing rc.local file), the only minor trouble I have is resuming the laptop from "sleep" mode. If I close the lid and then wake the laptop opening it again, there is no audio/sound. I need to restart the computer (not even logging out helps). If I suspend the computer in a graphical way (not closing the lid): gearwheel in top right of the screen -- suspend and wake it up/turning on, audio works with no issues. Ideas how to fix this? Thanks!

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• How do I duplicate a Box2d simulation, mid-simulation?

  - by Whyte

  I want to serialize the state mid-game, send it over the network to an identical computer (same CPU, same OS, same binary), load it there, and have the two games run in tandem doing the exact same simulation, without one of them drifting off and going haywire. In short: I want pop-in, pop-out networking support on my HIGHLY physics-intensive game, where sending object coordinates every few seconds is impossible, due to having thousands of objects, and many clients. I tried this with Box2D, and saving an object's location/velocity/etc wasn't enough... there's internal state that's not accessible through any public methods. My current workaround is to force EVERY client to save its entire worldstate and reload it from scratch, whenever a new player connects... but this is obviously bad practice, because it hangs the game for everyone whenever someone new connects. However, it works, with zero desynchronization. So, anyone know of any other techniques that can help me? Or should I just kiss my project goodbye?

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• New to Maven-- Creating Java EE Projects

  - by M.C.

  Greetings-- I've been developing Java EE web apps with Eclipse for about a year. My employer doesn't use Maven, but the more I read about it, the more convinced I am that Maven + Hudson will be greatly beneficial for us. First, though, I have to become comfortable with those technologies in my spare time, so that I can create a proof-of-concept. Right now, I'm still a Maven newbie. Is there a set of best practices for creating Java EE web apps with Maven? For example, I could create a project with a basic archetype and then add all of the necessary JARs by putting dependencies in the POM for the servlet container, EJB, EclipseLink, etc... That might work, but it might not be the best way to do it. I'd greatly appreciate any guidance that you could provide on this topic. Thank you very much!

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• Ubuntu One slow download sync speed

  - by Ian M

  I am having problems syncing my Ubuntu One files with my Ubuntu 12.04 fresh installation. Everything went well during the setup phase. Now, I am trying to sync back in my folders in my U1 account and the transfer speed is extremely slow. I am averaging a 15kb/s transfer speed. I tried uninstalling ubuntuone-client and reinstalling it. It did not fixed the problem. Right now U1 is stuck downloading a 50mb file. It is taking forever. Any ideas? Speed Test: http://speedtest.net/result/1922664547.png Screenshot: http://postimage.org/image/obs3f410z/

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• Setting up programs to startup at login

  - by Dhartman3076

  Have a new ponder hoping someone can answer. Keep in mind I am very new at linux and Ubuntu 14.04. What I would like to setup is setting certain programs to load at login to my account. I have not found a startup folder or setup options for programs to load at startup. Any Ideas? Please remember I am very new to linux and Ubuntu desktop. I am still learning my way around and the code for terminal sessions. So please be very descriptive in responses. Thank you...

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• Screen dims & freezes me out

  - by user287723

  New to Ubuntu 12.04 (used since 8th April). I have recently been using Firefox for an online course and while working on this virtual PC site, the screen dims and I am frozen out of interacting with my desktop. (I cannot switch to any other tabs in Firefox). Power setting set to suspend after 30 mins. The desktop is connected to the mains. Moving the cursor around appears to have no effect. This is making the course difficult to follow so any ideas would be appreciated. Thanks

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• Should I drawing directly on CCLayer or CCSprite?

  - by einverne

  Now I am a little confused in my cocos2d-x cpp project. I want to draw lines with user's finger touch. Following the screenshot of a CCScene: In the screen, there are two squares. I want show an animation in the first square and let the second one draw lines with user touch. Now these two squares are CCSprite. And I can draw dots in the second one on the CCLayer. But I am little confused that I should draw lines on the Sprite or on the Layer. Or are there other ways to organize the code?

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